So often RCA plugs need to have the outer connector "squeezed together" slightly to achieve a snug fit. This was not the case with these adapters, they fit perfectly! Highly recommend them if one needs M-M RCA-type adapters.
Like others here have mentioned, the connectors are just a little bit too big. They feel very loose and initially didn't give me a good connection. I pair of pliers took care of that and now they fit snug but I expected a little more from Monoprice. I wish they had these with the same type of connector as their "premium" RCA cables.
Wasn't getting a signal on the connection, spent a bunch of time trying to fix other things and then replaced this part and got my signal back. Found if I rotated the part the signal would go in and out.
It would appear the outer (ground) barrel of these adapters is a little larger than spec I was getting awful buzzing noises on all the channels I used them on due to a poor ground connection. I removed them, used a pair of pliers to bend the barrels down smaller, and then re-connected them. This solved the problem.
You just can't beat Monoprices Prices and the products are very high quality. Thicker cables in comparison with the likes of Radio Shack or Best Buy etc. Products arrived to me fast and were well packaged so no shipping damages. I don't buy adaptors and rca cables etc local anymore.
Unfortunately, the cons outweigh the pros. These absolutely do not have the proper compression necessary to be used in any kind of demanding audiophile application. They also did NOT fit snugly over my car audio amplifier's pre-amp RCA input jacks causing constant signal interruption. I had to purchase a set of $4/each Radio Shack adapters thereafter to correct my order mistake here, which negated the point of trying to save money. Thankfully, I only ordered 4 so the damage was limited to $1.80.
PROS: These m/m RCA adapters are very inexpensive and lightweight.
CONS: Do not fit properly over some RCA jacks - too loose and compression cannot be adjusted by manually manipulating the outer shielding.